A new method measuring the rotation center of hip joint and its significance for hip replacement surgery / 中国医师杂志

ABSTRACT

Objective@#To design and evaluate a new method for measuring the center of rotation of the hip joint, and to compare it with the traditional methods.@*Methods@#Data of healthy hips of 120 total hip arthroplasty (THA) patients (120 hips) and bilateral hips of 20 healthy volumteers (40 hips) were collected. A series of X-rays and magnetic resonance imaging (MRI) were taken from each patient with the hip joint abductted at differenct angles (0°, 7.5°, 15°, and 22.5°). The motion track of rotation center was obtained by comparing these X-ray and MRI images. The preoperative and postoperative data of 67 surgical patients who underwent two different measurement methods before surgery were compared.@*Results@#Compared with traditional measurement methods, the accuracy of our new method was significantly improved; the results of hip MRI verified the objectivity and accuracy of our new method; preoperative measurements and postoperative follow-up results showed that our new method had a better clinical effect than traditional measurements.@*Conclusions@#The team′s innovative new measurement method based on pelvic orthotopic X-ray photographs with different abduction angles of the hip shows more accurate data than traditional measurement methods and shows better clinical results.